Effects of brassinolide on nitrogen, phosphorus, and potassium uptake and utilization efficiency in ornamental Rhododendron

doi:10.14088/j.cnki.issn0439-8114.2026.04.021

Abstract

Abstract: The regulatory mechanisms by which brassinolide (BR) modulated nutrient uptake and utilization efficiency in Rhododendron were investigated. The results demonstrated that an optimal BR concentration (20 μmol/L) significantly promoted plant growth, enhanced photosynthetic performance, and improved root system architecture, thereby strengthening the uptake and utilization capacity for nitrogen, phosphorus, and potassium. The expression of key nutrient transporter genes, including the nitrogen transporter NRT1.1, the phosphate transporter PHT1.1, and the potassium transporter HAK5, was markedly upregulated by BR treatment. In addition, rhizospheric enzyme activities and microbial diversity were enhanced by BR, leading to an improved microenvironment for nutrient acquisition. Under reduced fertilization conditions, the adverse effects of nutrient deficiency on plant growth were effectively mitigated by BR. Collectively, it was indicated that BR enhanced nutrient uptake and utilization efficiency in Rhododendron through coordinated mechanisms involving root development, transcriptional regulation of transporter genes, and optimization of the rhizosphere microecological environment.

Key words: brassinolide, Rhododendron, reduced fertilization, nutrient elements, uptake and utilization efficiency

CLC Number:

S68
Q945.12

WU Mei. Effects of brassinolide on nitrogen, phosphorus, and potassium uptake and utilization efficiency in ornamental Rhododendron[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(4): 131-140.

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